1904] 



the Cat's Foot studied by the Electrometer. 



95 



"1 



10-secs,- 



Fig. 4. — Cat's pad. 30 to 65 minutes post-mortem. Five single responses to exci- 

 tation of the sciatic nerve by instantaneous make-break induction shocks at 

 intervals of approximately 10 minutes. The dotted line shows the curve given 

 by y£oth volt through the preparation and electrometer. 



Time 

 post-mortem . 

 30 mins. 

 40 „ 

 48 „ 

 55 „ 

 65 „ 



o 

 o 



Latency. 

 1 *4 sec. 

 1-6 „ 



1- 7 „ 

 1'8 „, 



2- „ 



Magnitude of 



response. 

 -0123 volt, 

 -0100 „ 

 '0080 „ 

 -0048 „ 

 0-0018 „ 



20 



-L. 



50 



mlm 



"fO 



50 



60 sees. 

 I 



Fig. 5. — Kesponses to single shocks of increasing and diminishing strengths. 

 1 hour post-mortem. 



Voltage Strength 

 of response. 



Strength 

 of stimulation 

 2,000 

 3,000 

 4,000 

 5,000 

 10,000 



•0005 

 •0015 

 •0020 

 •0030 

 •0035 



of stimulation. 

 10,000 

 5,000 

 4,000 

 3,000 

 2,000 



Voltage 

 of response. 

 -0090 

 '0015 

 -0015 

 -0010 

 Ml 



MB.— This electrometer record is not very satisfactory, as the magnification was 

 taken too low. The following series of numbers observed without record with 

 higher magnification 45 minutes post-mortem is a better one : — 



Voltage Strength Voltage 



of response. of stimulation. of response. 

 1,000 Ml 4,000 0-0065 

 2,000 0-0015 5,000 '0125 



3,000 0-0035 10,000 Off scale 



Strength 

 of stimulation. 



